Using the uart to load the uboot


step1: net:  tftp ubootfile(the address is 0x80700000 normally) 

       uart:  loady    then choose the file in hyperterminal
 step2: nand erase 0x140000 0x20000
 
step3: nand write 0x80700000 0x140000 0x20000

### Ingenic U-Boot UART Configuration and Troubleshooting For configuring UART on an Ingenic processor within the U-Boot environment, understanding both the hardware specifics of the platform as well as how U-Boot interacts with this hardware is crucial. The configuration process involves modifying source files to ensure proper initialization and operation of the serial communication interface. #### Modifying Source Code for UART Support The UART settings can be adjusted through editing specific header or C files where definitions related to `CONFIG_SYS_NS16550` might appear when dealing with standard UART controllers like NS16550 compatible ones found in many embedded systems[^2]. For processors from Ingenic such as those based on MIPS architecture, one would look into board-specific configurations that define parameters including baud rate, data bits, stop bit(s), parity check mode among others. To customize these options: ```c #define CONFIG_BAUDRATE 115200 /* Default Baudrate */ #define CONFIG_CONS_INDEX 1 /* Console index (UART port number) */ ``` These lines typically reside inside a file named after your target board under `/include/configs/`. Adjustments here will affect console output during booting stages which could help diagnose issues later on if necessary. #### Common Issues and Solutions When encountering problems with UART functionality while working with Ingenic-based boards running U-Boot, consider checking several areas: - **Baud Rate Mismatch**: Ensure consistency between what's defined in software (`CONFIG_BAUDRATE`) versus external connections. - **Pin Multiplexing Settings**: Verify whether pins assigned for UART operations are correctly configured according to datasheets provided by manufacturers since incorrect assignments may lead to no transmission at all. - **Power Supply Levels**: Insufficient power supply levels affecting voltage thresholds required for reliable signal detection over RS232/TTL interfaces connected via UART ports should also not be overlooked. By addressing each potential issue systematically, successful resolution often becomes more straightforward even without direct experience using identical hardware platforms. --related questions-- 1. How does changing the baud rate impact system performance? 2. What steps must be taken before altering pin multiplexing settings? 3. Can insufficient power supplies cause intermittent failures rather than complete non-functionality? 4. Are there any special considerations needed when setting up multiple UART channels simultaneously?
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